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AAAC56 21/5/05 10:56 AM Page 126
56 Spinal nerves and cranial nerves I–IV

Nasal Temporal To
field of vision field of vision levator palpebrae superioris Cavernous
and superior rectus sinus
Superior orbital
fissure
Optic nerve
To
Optic chiasma
medial rectus
Position of pituitary
To
inferior rectus
Optic tract Parasympathetic fibres
To
inferior oblique
Ciliary ganglion
Fig.56.1
The optic chiasma. To Short ciliary nerves
Only the fibres from the nasal side of the retina sphincter pupillae
(i.e., the temporal fields of vision) cross in the chiasma and ciliaris
Fig.56.2
The oculomotor nerve.
Parasympathetic fibres are shown in orange
Superior orbital
Superior fissure Cavernous Trochlear
oblique sinus nerve

Abducent
nerve
Lateral Internal
rectus carotid Petrous
artery temporal
Fig.56.3
bone Ophthalmic V
The trochlear and abducent nerves. Maxillary V
The trochlear nerve arises from the dorsal surface of the brain Mandibular V

Auriculotemporal

Supraorbital
Greater occipital

Infraorbital
Lesser occipital
Greater auricular
Mental
Supraclavicular
Transverse
Sternomastoid
cutaneous
Clavicle
Fig.56.4
The main sensory nerves of the face and neck

126 Head and neck